This filter was found in an American publication from the 1980s. The circuit can be implemented with any operational amplifier. The power supply must be symmetrical.
This two-transistor circuit was found in American documentation from the 1990s. The circuit can use...
This circuit was found in a French publication called Generation Electronique, It can be assembled...
This circuit is from Motorola's 1993 Linear Interface ICs. The circuit must be powered by a...